Wow, overprinting white with water-based pigments is possible! I tried three types of pigment: white tempera paint, china white gouache, and titanium white pigment dispersion from Guerra Paint and Pigment (see sidebar for web link). I got the best coverage using the pigment dispersion from Guerra straight out of the bottle, no paste and no water. This opens up some new possibilities for the future, like printing white on dark paper.
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